# Opinion A BNB Chain order book for macro, crypto and sports outcomes, resolved by its AI oracle. *https://predictionmarkets.tools/tools/opinion · Prediction Market Venues* ## Facts ### At a glance | Field | Value | | --- | --- | | Vendor | Opinion | | Category | Prediction Market Venues | | Job | event_trading | | Website | https://opinion.trade | | Pricing model | commission | | Free tier | false | | Open source | false | | Licence | none | | Self-hosted | false | | Tested hands-on | no | | Claimed by vendor | no | | Last updated | 2026-10-23 | ### Availability | Field | Value | | --- | --- | | Jurisdictions | eu, asia, latam, au, ca | | Open to US persons | false | | KYC required | false | ### Markets | Field | Value | | --- | --- | | Subjects | politics, sports, macro, crypto, culture, business | | Settlement | crypto | | Resolved by | Opinion AI, the operator's own multi-agent AI oracle, on most markets (each market page names its method); a proposed result can be disputed by staking OPN tokens within a window of typically two hours, and a review decides. | ### Economics | Field | Value | | --- | --- | | Taker fee | 0.5 | | Maker fee | -0.25 | | Other fees | A $0.25 minimum fee on every taker order, charged on its first fill whenever the curve fee comes to less; $5 minimum order and $5 minimum withdrawal. | | Liquidity model | clob | | Platforms | web | | AI features | none | ### Interfaces | Field | Value | | --- | --- | | API | true | | WebSocket | true | | Scripting | none | | Python | true | | MCP server | false | | Export | api | ### Capabilities Yes: order_book, automation, live_trading, portfolio_tracking No: charting, screening, backtesting, paper_trading, calibration_scoring, cross_venue, alerts, news, tax_reporting, copy_trading *Verified: pricing 2026-10-23; availability 2026-10-23; economics 2026-10-23; markets 2026-10-23; capabilities 2026-10-23.* ## What it is Opinion is a prediction-market exchange on BNB Chain, run at opinion.trade. Each market is a pair of outcome tokens trading on a central limit order book; positions are collateralised in a settlement token (the documentation names USDT, and the public API lists the same contract as the quote token on every activated market, `0x55d398326f99059fF775485246999027B3197955`, read on 23 October 2026), and a correct position redeems for one unit of it. That contract reports itself as "Tether USD", but it is the Binance-pegged BSC-USD token rather than one Tether issues: Tether's own list of supported chains gives no USD₮ contract on BNB Smart Chain. What that means for a holder is set out in [what backs an on-chain venue's dollar](https://predictionmarkets.tools/guides/what-backs-an-on-chain-venues-dollar). The operator in the Terms of Use, last updated 19 October 2025, is **Superchillclub Limited**, under the laws of Panama, with arbitration in Panama. The documentation and the app speak as "Opinion Labs" and as OPINION; the terms are the document that names the counterparty to your agreement. The pitch is macro: the about page is built around trading a CPI print or a Fed decision directly instead of a proxy. What the book holds on any given day is wider than that. On 23 October 2026 the public API listed 172 activated markets, of which 95 carried a sports label and 39 an esports one, beside crypto, finance, politics, business and culture. Self-custody runs through a connected wallet or a social login. Opinion pays the on-chain gas for matching and settling trades; you pay gas for low-frequency actions such as filing a dispute or claiming a reward. ## Availability **Closed to the United States and to a list of others, by residence, location and citizenship.** The Terms of Use bar trading by anyone "residing in, a citizen of, organized in or located in" the United States, the United Kingdom, France, Ontario, Singapore, Poland, Thailand, South Korea, the People's Republic of China, Taiwan and Hong Kong, as well as any comprehensively sanctioned jurisdiction (Iran, Syria, Cuba, North Korea, and the Crimea, Donetsk and Luhansk regions are named). The citizenship test is the unusual part: a US citizen living abroad is barred as well. A restricted person may still use the site's content features and may not touch the trading platform. VPN use to get round the restriction is prohibited, and the stated consequence is that the wallet is put into close-only mode. There is no identity check at signup. The terms reserve the right to ask for information confirming you are not a restricted person and to cut access if it is not provided. You must be 18 or older. Read 2026-10-23. The jurisdiction field above is coarse: Europe excludes France and Poland, Asia excludes six named markets as well as the sanctioned ones, and Canada excludes Ontario. ## Pricing **The vendor's unit: a taker fee of 0% to 1% of the fill, on a curve that peaks at 50 cents.** The formula on the fees page is `topic_rate × price × (1 − price)`, applied to the notional (price × quantity) of each matched fill, then multiplied by any discounts. The maker-rebates page works its examples at a 4% base rate and spells out that it is not the percentage you pay: at a price of 50 cents the curve factor is 0.25, so the effective rate is 1% of what the fill costs, which is the top of the fees page's 0%-to-1% range. **Why the fee field reads 0.5 and not 1.** The 1% is a share of the stake, not of the payout. Buying a share at 50 cents costs 50 cents, and 1% of that is 0.5 cents, which is 0.5% of the $1 the share pays. At 10 or 90 cents the same base rate charges 0.36% of the fill. Individual markets can carry a lower or zero `topic_rate`; the field holds the top of the published range. **Makers pay nothing and are paid.** Resting orders are free, and under the Maker Rebates Program every filled maker order earns 50% of the curve fee the taker generated, calculated per fill and paid daily in the collateral token, with no sign-up. At 50 cents that is 0.25 cents a share, which is why the maker field is negative. The rebate is always calculated on the full curve fee, before the taker's discounts and never on the minimum fee. **The minimum fee is the number to plan against on small orders.** Every taker order pays at least $0.25, charged on the first on-chain fill of that order. At 50 cents the curve fee only reaches $0.25 on a fill of $25, so on the $5 minimum order the floor is 5% of the stake. Discounts — a referral binding worth up to 10%, promotional discounts, and a VIP programme the docs still list as "coming soon" — multiply together and cannot take a fee below the floor. The minimum order and the minimum withdrawal are both $5. No withdrawal fee is published beyond the gas you pay yourself. Fee pages read on 2026-10-23. ## Markets & resolution The resolution page is two sentences: the method is specified on each market page, and "at present, most markets are resolved through Opinion AI, which serves as the primary oracle mechanism". The welcome page describes Opinion AI as a decentralised multi-agent AI oracle that also helps write the rules for user-created markets. The public API carries a flag for it, and on 23 October 2026 it was set on 27 of the 172 activated markets, most of the rest being sports and esports fixtures. The rules text the API returns for those names a resolution source of its own, such as HLTV for a CS2 match. **Disputes are staked, single and first-come.** When a result is proposed, a dispute window opens, typically two hours except on some asset-price markets. Any user may challenge it as wrong or too early by staking OPN, the greater of 1% of the market's open interest and 1,000 OPN, priced off Binance's OPN/USDT rate. Only one dispute is allowed per resolution. An accepted dispute returns the stake plus an equal reward, a rejected one forfeits it, and if the review window runs out the dispute succeeds automatically and the market can be resolved again. With no dispute the result finalises when the window closes. Two documents point in different directions here. The documentation calls Opinion AI the primary oracle; the Terms of Use say the company "is not involved in nor responsible for the resolution of any Prediction Markets", while also reserving to the company the choice of oracle sources for each market and the right to suspend or cancel a market it cannot resolve. **Liquidity is uneven.** On the same day the homepage's own figures showed a single esports market with about $2.5 million of 24-hour volume, while the three long-dated markets the API ranked highest had last traded between June and early September, and the day's new esports fixtures had empty books. ## Integrations Three published interfaces, one key for all of them: - **OpenAPI** — REST market data: markets, latest price, order book, price history, quote tokens. Public endpoints need no key and are limited to 5 requests a second per IP; a key, created with a wallet signature, raises that to 15. It cannot place orders. - **WebSocket** — live price, trade and book-change streams and market status events, with user channels for your own orders. - **CLOB SDKs** in Python and TypeScript — the only documented route to placing, cancelling and managing orders from code, including split, merge and redeem, and a builder mode for apps that onboard their own users. [CCXT](https://predictionmarkets.tools/tools/ccxt) and [PMXT](https://predictionmarkets.tools/tools/pmxt) both carry Opinion among their venues, and [ArbBets](https://predictionmarkets.tools/tools/arbbets) and [Predexon](https://predictionmarkets.tools/tools/predexon) read its prices. ## Limitations - **The citizenship clause.** Barring citizens as well as residents removes US citizens abroad, which the location-based geoblocks of most offshore venues do not. - **A $0.25 floor per order.** On small tickets the minimum, not the curve, sets the price. - **Resolution leans on the operator's own AI.** The appeal path is a single staked dispute, and disputing needs OPN tokens in a wallet you control. - **Terms and documentation disagree on who resolves**, and the terms are the governing document. - **No identity check is not the same as open access.** The operator can demand information at any time and close or freeze an account in close-only mode. - **Thin books away from the busiest markets**, read from the venue's own API and homepage. - **Nobody here has funded an account.** Everything above is read from Opinion's documentation, Terms of Use and public API on 23 October 2026. ## Alternatives [Polymarket](https://predictionmarkets.tools/tools/polymarket) is the larger on-chain order book with an external oracle, UMA, rather than an in-house one, and a geoblock based on physical location. [Limitless](https://predictionmarkets.tools/tools/limitless) and [Myriad](https://predictionmarkets.tools/tools/myriad) are the other offshore crypto-settled venues in this category; the head-to-head of [offshore venues](https://predictionmarkets.tools/compare/offshore-prediction-market-venues) sets them side by side. A US reader needs a CFTC-regulated exchange such as [Kalshi](https://predictionmarkets.tools/tools/kalshi) instead. ## FAQ ### What does a trade on Opinion cost? Takers pay a fee on a price-times-one-minus-price curve, at most 1% of what the fill costs at a price of 50 cents (0.5¢ a share), with a $0.25 minimum per order. Makers pay nothing and are rebated half of the curve fee the taker generates, paid daily in the same token. ### Can US residents trade on Opinion? No. The Terms of Use bar anyone residing in, located in or a citizen of the United States, as well as the UK, France, Ontario, Singapore, Poland, Thailand, South Korea, mainland China, Taiwan, Hong Kong and sanctioned territories. Restricted persons may read the site but not trade, and VPN use is prohibited. ### Who decides how an Opinion market resolves? The method is named on each market page, and the documentation says most markets are resolved by Opinion AI, the operator's own AI oracle. Any user can dispute a proposed result during the dispute window by staking OPN tokens; an accepted dispute returns the stake plus an equal reward, a rejected one forfeits it. ### Does Opinion need identity verification? Not at signup. An account is a connected wallet (Binance Wallet, OKX Wallet, MetaMask, Backpack or Coinbase Wallet) or a social login. The terms let the operator ask for information later to confirm you are not a restricted person, and close access if you do not supply it. ### Is there an API for Opinion? Yes, in three parts. A REST OpenAPI for market data whose public endpoints need no key, a WebSocket for live books and trades, and CLOB SDKs in Python and TypeScript, which are the only route to placing orders from code. ## Background - [Event contract or swap, and why the label decides the case](https://predictionmarkets.tools/guides/event-contract-vs-swap.md) — Whether an event contract is a swap under the Commodity Exchange Act decides whether a state may regulate it. Three circuits have read it, and they divide. - [How a venue changes its rules, and where you can see it coming](https://predictionmarkets.tools/guides/how-a-venue-changes-its-rules.md) — A US exchange's rule changes wait ten business days in public; a fee under a dollar a contract need not. Broker fees and offshore terms change when posted. - [How much one account may hold, and what happens past the line](https://predictionmarkets.tools/guides/how-much-one-account-may-hold.md) — Position limits and accountability levels sound alike and work differently. Where each venue draws the line, in which unit, and what happens past it. ## Also worth comparing - [Futuur](https://predictionmarkets.tools/tools/futuur.md) — Play-money and real-money markets side by side, priced by an LS-LMSR market maker. - [Hyperliquid Outcome Markets](https://predictionmarkets.tools/tools/hyperliquid-outcome-markets.md) — HIP-4 outcome contracts on Hyperliquid's own chain, from daily crypto binaries to sports. - [Limitless](https://predictionmarkets.tools/tools/limitless.md) — Event contracts on Base, collateralised in USDC, traded on a central limit order book. - [Myriad](https://predictionmarkets.tools/tools/myriad.md) — Multi-chain event markets on an order book, some on an AMM, paid in stablecoins or points. - [Polymarket](https://predictionmarkets.tools/tools/polymarket.md) — Self-custody event contracts on an on-chain order book, resolved by the UMA oracle. - [Predict.fun](https://predictionmarkets.tools/tools/predict-fun.md) — A BNB Chain order book in Binance-pegged USDT, where open positions earn Venus yield.